RSS not working?

For some reason, my RSS plugin has stopped showing my external RSS feed on my blog.

This has happened on both my wordpress blog on my own domain and my wordpress.com blog.

The feed is working fine, as it shows in firefox and also on my blogger.com blog.

You can see the errors here –

http://www.ohlookaforum.com/blog
http://ohlookaforum.wordpress.com/

The feed can be seen here –

http://www.ohlookaforum.com/rss.php?mode=news

Any help appreciated.